Circuit Description
If the EBTCM detects excessive use of the antilock brake system or traction control system, the EBTCM will disable the traction control in order to prevent a possible brake over temperature condition.
Excessive braking and/or traction control may result in the following conditions:
| • | Degraded braking performance |
| • | Damage to the rotors |
| • | Damage to the brake pads |
Conditions for Setting the DTC
The temperature values are an estimated figure calculated by the EBTCM. If the temperature value exceeds the Brake Thermal Model limit, the DTC is set.
Action Taken When the DTC Sets
The following actions are taken when the DTC sets:
| • | A malfunction DTC is stored |
| • | The EBTCM illuminates the TRACTION OFF indicator |
| • | The TCS is disabled for as long as both of the driven brake wheel rotor calculated temperatures are above the estimated figure |
| If the calculated rotor temperatures go below the estimated figure, then the TRACTION OFF indicator will turn OFF. |
Diagnostic Aids
The following conditions may cause the brake thermal model to exceed the limit:
| • | Repeated, heavy use of the antilock brake or traction control systems |
| • | An intermittent wheel speed sensor signal |
The malfunction is probably a defective EBTCM if the following conditions exist:
| • | The driven wheel brake rotors are below the estimated figure |
| • | The brake lamp switch is properly adjusted |
| • | The brake lamp switch circuit is OK |
The scan tool can be used to observe the Brake Thermal Model (BTM) parameter. This displays the status as determined by the EBTCM.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the ABS Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Are there any other ABS/TCS DTCs? | -- | Go to Diagnostic Trouble Code (DTC) List for the appropriate DTC | Go to Step 3 |
3 |
Is the Brake Thermal Model (BTM) exceeded? | -- | Go to Step 4 | Go to Step 5 |
4 | Replace the EBTCM. Refer to Electronic Brake and Traction Control Module Replacement . Is the replacement complete? | -- | -- | |
5 | Check the brake switch for misadjustment. Is the brake switch misadjusted? | -- | Go to Brake Release Switch Adjustment Cruise Control |
